Excavator.



No. 648,720. Patented May I, I900. G. W. BARNHART &. G. W. KING.

EXCAVATUR.

(Application filed. July 2, 1a

(No Model.)

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, QM J QM EA/Q s UNITED STATES PATENT OFFICE.

GEORGE W. BARNHART,'OF SAN FRANCISCO, CALIFORNIA, AND GEORGE W. KING, OF MARION, OHIO, ASSIGLIORS TO THE MARION S'lEAllI SHOYEL COMPANY, or MARION, 01110.

Ex cAvA ro R.

SPECIFICATION forming part of Letters Patent No. 648,720, dated May 1,1900. Application and July 2,1398. Serial No. 685,011. on model.)

To all whont it may concern:

Be it known that we, GEORGE IV. BARN- HART, residing at San Francisco, county ofSan Francisco, State of California, and GEORGE W. KING, residing at Marion, county of Ma rion, State of Ohio, have invented certain new and useful Improvements in Excavators; and

we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains-t0 make and use the same.

Our invention relates to improvements in excavators, and appertains more especially to a machine of the character indicated that comprises the following elements: a boom, a socalled clam-shell excavating-bucket having a long handle or stem and comprising any suitable number of sections hinged or pivoted at the top and capable of separating and thereby opening the bucket; other means, preferably a suitably-operated and suitablyapplied cable for closing thebucket and thereupon hoisting the bucket and holding the sec- 2 5 tions of the bucket closed togetherwhile the bucket is being hoisted; other means, preferably a suitably-operated cable-tor supporting the load preparatory to and during the dumping of the load after the bucket closing and hoisting cable" has been released, and a suitably-operated clamping device for positively holding the buckets stem while the bucket is being closed.

The primary object of the invention is to provide means for clamping the stem of the bucket after the latter has been dropped with its jaws open and'preventing the bucket from rising out of the mud or material being operated upon while the sections of the bucket are being closed together preparatory to the hoisting of the load.

WVith this object in view andto the end of realizing certain structural advantages hereinafter noted the invention consists in cer- 5 tain features of construction and combinations of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure I is a side elevation of an excavator embodying ate below the outer end of the boom.

our invention. Fig. II is a top plan of por- 5o tions of the same. Fig. III is a top plan of the outer portion of the boom and shows among other things the clamping device for clamping the handle or stem of the shovel.

Fig. IVis a side elevation of the outer end of such a manner as to render it capable of being swung or adjusted laterally, and to this end the outer portion of the boom is connected by any suitable number of rods 1 with a sleeve B that is rotatably mounted upon the vertical pin or bearing 0, with which the upper end of the upright framework 0 of the body portion is provided, and which constitutes the upper pivotal center of the boom, that at its inner end and at the bottom is provided with a sleeve l3, that is mounted upon the vertical pin or bearing a, with which the hull or body portion of the machine is 'pro vided, and which constitutes the lower pivotal center of the boom. The upper pivotal center of the boom is coincident with the booms lower pivotal center." The excavating shovel or bucket G is arranged to opelr- 'l e bucket is of the elam-shell variety and comprises, preferably, two scoop shaped sections or jaws g 9, that are capable of swinging in a vertical plane towardand from each other, and consequently each section g is pivoted at the top and outer side horizontally to the lower end of an arm or arms g, that depend from the lower end ofthe handle or stem G, with which the bucket is providedthat is, the upright handle or stem G of the bucket at its lower end is provided with any suitable number of arms g, to which one of the bucket-sections at the latters top and outer side is pivoted, and is provided with another arm or arms g, to which the other [2 stereo bucket sectiou at the latters top and outer sideis pivoted, and of course the bucket-sections have their axes parallel.

,- in solid dines, Fig. I, the bucket is shown both bucketsections and has its axis parallel with the axes of the bucket-sections, and thence the cable leads upwardly to and over a sheave B, that is supported from the outer end of the boom and arranged vertically and longitudinally of the boom, and from the said sheave B the cable leads rearwardly, prefer ably in a horizontal plane, to and between horizontally-arranged sheaves 0 that are supported from a platform C1 of the upright frame 0, at or near the latters central portion, and thence the cable leads rearwardly to and over a vertically-arranged sheave C, that is supported from the said fli't'tlflfljtll the I rear ofthe sheave C, and thence the cable loads downwardly to and opcratively engages the winding-drum K thatis loosely mounted upon .a suitably-driven shaft D, that is ararrangcd transvcrselyof and supported from the body port-ion, and a suitably-operated clutch 1) upon the said shaft is employed for establishing and interrupting operative con ncction between the drum and the shaft.

Each bucket-section 7 (one only being shown in Fig. I) is connected by two links g with opposite ends, respectively, of the axle orpin 7.: that bears the bucket-sheave K, which links at one end embrace the said axle or pin and at their oppositocnd are pivoted to the bucket-section parallel with the latters axis.

By our construction it is obvious that when the bucket is in its open position, as shown in dotted lines, Fig. I, a pull upon the hoistin g-cable K to the extent required by winding it upon the engaging drum will result in the elevation of the bucket-sheave Khand thereby through the connection bet'wcen the bucketsheave K and the bucket-sections close togethcr the bucket-sections, as shown in solid lines, Fig. I, against the action of the gravity of the said sections. After the laden bucket has been released from the clamp and elevated to the proper height and swung to the dumping-point the bucket closing and hoisting cable K is released, while another sable 0, called the dumping-cable and attached to the buckcts stem, is employed in lifting the load, and upon the support'of the load by cable 0 after the release of cable K the jaws or sections of the bucket proper open bygravity. The bucket after dumping is: lowered and has its descent controlled by the cable 0, and as soon as the bucket is in position to take another load the clamping device is rendered operative, and then the bucket closing and hoisting cable K is-again; operated. The dumping-cable O is attached-at one-end, as

at O; to the lower-end of the handle or stem of the bucket and thence leads upwardly to and over a sheave B that is supportedfrom' the outer end of the boom and has its axis coincident with the'axis of the sheave B and thence the cable 0 leads rearwardly to and between horizontally-arranged sheaves C, that 'are supported from theframe O, and thence to and over the vertically-arranged sheaveG that is supported from the said frame and, has itsaxis coincident with the axis of the sheave C and thence leads downwardly to and operatively engages the wind ing-drum 0 that is loosely mounted upon the shaft, and a suitably-operated clutch D upon the said shaft is provided for establishing and interrupting operative connection between the drum and the shaft.

The clamping device foren gagin g the buckets stem, and thereby holding the bucket propa-ratory to the closing of the bucket while the latteris in the mud or material being operated upon, comprises, preferably, the following: The said stein extends upwardly through the outer end of the boom and has bearing in a box Q, that is arranged centrally within an opening 1), formed in and extending vertically through the outer end of the boom. Box Q has two trun uions Q Qprojecting from opposite sides, respectively, of the box and supported from opposite side walls, respectively, of the opening I). The box, and consequently the bucket, is therefore capable of oscillatinglongitudinally of the boom, and opening 1) is large enough longitudinally of the boom to accommodate a limited tilting or oscillation of the bucket-stem or bucket in the said direction. The surrounding wall of the bucket-stem-engaging bore Q between the said bore and the inner end of one of the trunnions has a recess Q that is in open relation with the bore Q and the lower wall Q of the said recess affords a hearing or seat for the movable jaw R of the clamping device, which jaw .is arranged to engage the adjacent side of the buckebstem and clamp the latter against the opposite wall of the bore Q which wall forms the stationary jaw of the clamping device. J aw R is rendered operative or inopera-.

rive according as it is forced against or loosened relative to the bucket-stem, audthe means for exerting a pressure upon the aw comprises in the case illustrated a suitablyoperated screw R, arranged horizontally and transversely ofihe boom and engaging the outer side of the said jaw R. Screw R ongages the nut Q formed integral with the box Q, and extends through the contiguous trunnion of the box, and at the outer side of the trunnion is operatively provided with a pulley R, that is operatively connected by a chain or cable R with a pulley R operatively mounted upon the suitably-operated shaft R, that is arranged transversely of and supported from the inner end of the boom and is provided with a hand-wheel R for operating the same. It is obvious that the movable clamping-jaw R is rendered operative or inoperative according as the shaft R is turned in the one or the other direction. The trunnion-engaging holes b in the side walls of the opening bin the boom are elongated vertically to afford a limited swing to the bucket transversely of the boom. The limited capability of the bucket and its stem to swing longitudinally and crosswise of the boom prevents any unduestrain from any cause upon the parts during the operation of themachine. It is obvious, of course, that the bucket-stem is released as soon as the bucket has properly closed upon taking a load to accommodate the shifting of the bucket to the place of dumping.

What we,claim is-- 1. In an excavator, the combination with the boom, and the suitably-operated bucket arrangedtooperate below the boom and pro vided with an upwardly-extending stem; of

a box affording lateral bearing for the stem, which box is supported from the boom and has a limited play up and down, substantially as and for the purpose set forth.

2. In an excavator, the combination with" a box afiording lateral bearing for the stem,

and having two trunnions projecting from opposite sides, respectively, of the box, which trunnions are supported from the boom and have a limited play up and down, substantially as and for the purpose set forth.

3. In an excavator, the combination with the boom having an. opening 1) extending vertically through its outer end and having the vertically-elongated openings 5, and the suitably-operated bucket and the latters upwardly-extending stem; of the box Q having the trunnions Q, the bore Q and the recess Q the movable clamping-jaw B, and means for operating the jaw, all arranged and operating substantially as shown, for the purpose specified.

Signed by us at of April, 1898. v

GEORGE W. BARNHART. GEORGE W. KING.

Witnesses:

W. R. WADDELL, A. E. CHENEY.

Marion, Ohio, this 7th day 

